Door open signal system



K. ZAJC DOOR OPEN SIGNAL SYSTEM March 16, 1948.

Filed March 20, 1945 2 Sheets-Sheet l INVENTORQ ATTORNEK K. ZAJC DOOR OPEN SIGNAL SYSTEM March 16, 1948:

Filed March 20} 1945 2 Sheets-$het 2 N c M m1 r N a M I Z Patented Mar. 16, 1948 UNITED STATES PATENT OFFICE DOOR OPEN SIGNAL SYSTEM Karol Zajc, New York, N. Y.

Application March 20, 1945, Serial No. 583,764

4 Claims. 1

This invention relates to new and useful improvements in safety contact double door opener switch.

It is customary to mount an electric lock upon the jamb of a door and to mount the keeper on the door. With this arrangement when the push button is depressed it operates the electric lock which keeps on operating and making a noise as long as the push button switch is held down. This invention proposes to mount the electric lock upon the door and to mount the keeper upon the door frame or jamb. It is proposed to provide certain cooperative contacts mounted on insulation members on the door, and door jamb which engage each other only when the door is closed.

These contacts are connected up in an electric circuit for controlling the electric lock. Now when the push button switch is closed for opening the lock, the current to the electric lock will be instantly cut when the door is opened. This stops the operation of the electric lock and the noise even though the push button is held down.

The invention also proposes to associate a bell or signal with the door which will operate when the door is opened. It is proposed to mount a certain control switch for the bell on the door jamb so that when the door is closed the push button of the switch is depressed. It is proposed to associate certain mechanisms with the push button switch so as to control operation of the bell or signal in desired way.

Still further the invention proposes the construction of a hinged door and associated mechanism as briefly explained, which is very desirable, simple in construction and which may be manufactured and sold at a low cost.

For further compression of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a fragmentary elevational view of a closed door provided with mechanism construction in accordance with this invention.

Fig. 2 is a fragmentary perspective view of a portion of the door frame and the door illustrating some of the mechanism, in detail.

Fig. 3 is a fragmentary enlarged vertical sectional view taken on the line 3-3 of Fig. 2.

Fig. l is a fragmentary transverse vertical sectional view taken on the line 4-4 of Fig. 3.

Fig. 5 is a fragmentary sectional view taken on the line 5-5 of Fig. 2.

Fig. 6 is a perspective view of another portion of the door and door frame disclosing another part of the improved mechanism.

Fig. '7 is a fragmentary enlarged vertical sectional view taken on the line 1-1 of Fig. 6.

Fig. 8 is an enlarged detailed View similar to Fig. '7 disclosing a modified form of the invention.

Fig. 9 is a schematic wiring diagram of the device shown in Fig. 8.

The new and improved safety contact double door opener switch, in accordance with this invention is shown used in combination with a hinged door ID. This hinged door In is mounted in a usual door frame, or door jamb H, with the usual hinge 12. An electrically operated lock I4 is mounted upon said door In and is cooperative with a keeper l5 mounted in the door jamb.

Insulation members [5 and l! are mounted upon said door jamb, or frame H, and on said door In in a position to be adjacent each other when the door is closed. A pair of contacts iii are mounted upon the insulation member [6 and are cooperative with a pair of contacts l9 mounted upon the insulation member IT.

The insulation members l6 and I! are in the nature of boxes constructed of insulation material. These boxes are mounted in recessed portions formed in the door jamb, and in the door, and held in position with fastening elements, or screws 20. Each of the insulation boxes l6 and ll, has an opening through which electric cables such as cables 22 and 23 may enter. The contacts 18 are fixedly mounted. Leads from the cable 22 connect with the inner ends of the contacts I8. The contacts it! are in the nature of push buttons. Each of these contacts are slidably mounted in a socket 24. Each of the contacts l9 has an interior stem 25. Expansion springs 26 are mounted upon the stems 25 and act between stationary insulation member 2'! and the contacts [9 for normally urging the contacts 19 into slightly projected positions.

Insulation members 21 are stationarily mount ed within the box-like insulation member ll. The leads from the cable 23 are connected with the inner ends of the stems 25 so as to indirectly connect with the contacts IS. The cable 23 electri. cally connects with the electric lock l4, see Fig. 1, by which the necessary current may be supplied to the lock. The cable 22 connects with the usual push button control switch, not shown, and electric current supply for the operation of the electric look. For example, in homes, the outer doors V astationary bracket-.5 L

are usually closed with electric looks so that tenants on upper floors may open the door downstairs by pressing push buttons.

An important feature of the new construction hereabove disclosed, resides in the fact that when the door H] is closed it is possible to operate the electric lock Mby sending an electric current through the cable 22. The current from the cable 22 will reach the leads of the cable, which are connected with the contacts [8. When the door is in its closed position, the contacts IS'enga'ge said contacts I 9 so that the electric current passes through the cable 23 to the electric lock M. As soon as the door is opened, the electric current will be broken, because the contacts [8 and [9 will be separated. Now the electric lock [4. stops operating, and stops making noise, even. though.

the push button switch, not shown, controlling the cable 22 is held closed.

In Figs. 6 and 7 a further embodiment of the invention. has been disclosed, in, which the-door frame H, or jamb is provided with a push button switch 30 for controlling an electric bell, not shown on the'drawing. The push button switch 30 includes a box-like insulation member 3| which-is mounted onthe door jamb, or frame- H with fastening elements 32. A push button 330i insulation material, normally projects from: the insulation member 3|. This push button 33 is provided with an interior stem- 34-connectedwith one of the leads of a cable 35. A. springSS- is 'coaxially mountedonthe stem 34- and acts against a stationary member 31 mounted upon the insulation member 3L. -The spring 36; acts against the button 33 to urge it into an extended position. 7 I r The button 33 carriesa contact -38 which engages a contact 39, when the push button33 is in its extended positionp The contact 39;-isconnected withthe other lead ofthe'cable-35.' When the door '10- is opened, the push button 33 will be extended by the spring 36, and. the contacts 33 and 39, will engage each other closingthe switch and operating an electric hell, not shown. The signalthus given will indicate that the door is still open. As soon-as the-door is closed, the button 33 will-be depressed opening the switch 30.; The bellthen stops ringing.

In Figs. 8"and9'sti1l another iormof' the invention has been disclosed which is verysimilar to the form shown in Figs. fi and 7 but distinguishing in the fact that anew andimproved control for the-ringing ofthe belLhas been pro;- vided. This control will operate the bell in a certain way, More'specifically; the-bell. is. connected in an electric; circuit M which includes in series said bell 40,- a circuit interrupter 42; a high resistance 43 and' the contacts381and 39. 'The oireuit interrupter tz may be in the nature of a bi-metalthermostat. which bends. away from a stationary contact 44- when. it becomes heated and bends towards and engagesithe stationary con tact when cook A shunt circuit bi-passes the high resistance 43 and said circuit 42 and includes in series a contact arm t1 anda bi=metal thermostat-:48: controlling the shunt circuit 48'.

- The contact. arm dl'is resiliently urged against the: end ofsthe bi-metal thermostat 48" by aspring 50.; The contact-arm 41 is .pivotally mounted on A control rod Z is slidably mounted'in stationary. brackets 53 and connects with the contact arm A! for moving the contactarm into a loaded position, as will become clear as this specification proceeds. 'The stem 34 is: provided. with an arm. 55 made- 0f insulation material for moving the rod 52, and so indirectly moving the contact arm 47 into its loaded position.

In other respects this form of the invention is identical to the prior form and like parts may be recognized by like reference numerals.

'bell circuit 4| is now closed. An electric current will flow through the low resistant contact arm 41, the low resistant bi-metal thermostat t8 and the shunt circuit 46. This causes the bell ll to ring loudly because it is receiving full current.

An instant later, the bi-metal thermostat 43 will flex, downwards, as indicated by the dot and dash lines 48' in Fig. 8. This causes the contact arm. 41. to move upwards to the dot and dash line, position Q1. The circuit is now open through the shunt 46. The current will therefore flow through the high resistance 43 and through the bi-metal thermostat 42. The bell will. now ring weakly. An instant later. the thermostat 42 will open and the bell will stop ringing, The neXt instant the thermostat 42 will closeand the bell will ring again. This weakly intermittent ringing of the bell will continue untilthe door is closed. Then the contact 38 is moved away from the contact 39 and thealarm circuit 4! is open.

When the push button 33 was moved inwards by the closing of the door, the arm 55 will engage against the rod 52, moving the rod 52 and indirectly moving, the contact arm 'i back to its loaded position against the edge of the thermostat 48., The parts are now in their original positions.-

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention asdefined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In combination with a hinged door, an insulation housing having mounted on the jamb of said door, a push button projecting from said housing to be pressed inwards when said door is closed, resilient meansurging said'push button outwards, a. stationary contact within said housing and a contact carried by said push button to engage saidstationary. contact when said push button is extended, a bell circuit including in series said contacts and a high resistance circuit interruptor, a shunt circuit by-passing said high resistance and circuit interruptor and including in series a contact armand a low resistance bimetal thermostat, means for pivotally supporting said contact arm, means for resiliently urging said contact arm against said bi-metal thermostat when the latter is cool and past the thermostat when the latter is warm, and means operated by said push button for resetting said contact arm against said thermostat when said push button is depressed.

2. In combination with a hinged door, an insulation housing having mounted on the jamb of said door, a push button projecting from said housing to be pressed inwards when said door is closed, resilient means urging said push button outwards, a stationary contact Within said housing and a contact carried by said push button to engage said stationary contact when said push button is extended, a bell circuit including in series said contacts and a high resistance circuit interrupter, a shunt circuit by-passing said highresistance and circuit interruptor and including in series a contact arm and a low resistance bimetal thermostat, means for pivotally supporting said contact arm, means for resiliently urging said contact arm against said bi-metal thermostat when the latter is cool and past the thermostat when the latter is warm and means operated by said push button for resetting said contact arm against said thermostat when said push button is depressed, said means for pivotally supporting said contact arm including a support bracket.

3. In combination with a hinged door, an insulation housing having mounted on the lamb of said door, a push button projecting from said housing to be pressed inwards when said door is closed, resilient means urging said push button outwards, a stationary contact within said housing and a contact carried by said push button to engage said stationary contact when said push button is extended, a bell circuit including in series said contacts and a high resistance circuit interrupter, a shunt circuit by-passing said high resistance and circuit interruptor and including in series a contact arm and a low'resistance bimetal thermostat, means for pivotally supporting said contact arm, means for resiliently urging said contact arm against said bi-metal thermostat when the latter is cool and past the thermostat when the latter is warm and means operated by said push button for resetting said contact arm against said thermostat when said push button is depressed, said means for pivotally supporting said contact arm including a support bracket, and said resilient means comprising a spring acting between said bracket and said arm.

4. In combination with a hinged door, an insulation housing having mounted on the jamb of said door, a push button projecting from said housing to be pressed inwards when said door is closed, resilient means urging said push button outwards, a stationary contact within said housing and a contact carried by said push button to engage said stationary contact when said push button is extended, a bell circuit including in series said contacts and a high resistance circuit interruptor, a shunt circuit by-passing said high resistance and circuit interruptor and including in series a contact arm and a low resistance bimetal thermostat, means for pivotally supporting said contact arm, means for resiliently urging said contact arm against said bi-metal thermostat when the latter is cool and past the thermostat when the latter is Warm, and means operated by said push button for resetting said contact arm against said thermostat when said push button is depressed, including an arm connected with said push button, a rod to be moved by said button and connected with said contact arm,

KAROL ZAJC.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 315,186 Thaxter Apr. '7, 1885 668,650 Letzing Feb. 26, 1901 997,036 Blackburn July 4, 1911 1,170,032 Williams Feb. 1, 1916 1,789,566 Spray Jan. 20, 1931 1,938,150 Marateck Dec. 5, 1933 

